In the 1990s reported autism cases among American children began spiking, from about 1 in 10,000 in 1987 to a shocking 1 in 166 today. This trend coincided with the addition of several new shots to the nation's already crowded vaccination schedule, grouped together and given soon after birth or in the early months of infancy. Most of these shots contained a little-known preservative called thimerosal, which includes a quantity of the toxin mercury.Evidence of Harm explores the heated controversy over what many parents, physicians, public officials, and educators have called an "epidemic" of afflicted children. Following several families, David Kirby traces their struggle to understand how and why their once-healthy kids rapidly descended into silence or disturbed behaviour, often accompanied by severe physical illness. But as they dug deeper, the families also found powerful allies in Congress and in the small community of physicians and researchers who believe that the rise of autism and other disorders is linked to toxic levels of mercury that accumulate in the systems of some children.An important and troubling book, Evidence of Harm reveals both the public and unsung obstacles faced by desperate families who have been opposed by the combined power of the federal government, health agencies, and pharmaceutical giants. In the end, as research is beginning to demonstrate, the questions raised by these families have significant implications for all children, and for those entrusted to oversee our national health.